The tool called Peepmail, created by Samy Kamkar who is known for the 2005 virus that took down myspace, promises to deliver email addresses for everyone from Steve Jobs to the random guy's business card you lost. Many email servers will tell the sender whether the address is valid, even before the message is sent.
When a user enters the name and company into Peepmail, the program tests permutations of the name until the company's email server responds with a message that indicates the address is valid. Before any emails go through, the program aborts the communication, so the person being looked up doesn't know it's happening.
I guess we don't have much privacy left these days..
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